Finding the Fourth Proportional to 3,426.72, 5,140.38 and 961.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,426.72 : 5,140.38 = 961.56 : x
2. Step 2: Convert to fraction form
   3,426.72/5,140.38 = 961.56/x
3. Step 3: Cross multiply
   3,426.72x = 5,140.38 × 961.56
4. Step 4: Simplify right side
   3,426.72x = 4,942,783.79
5. Step 5: Solve for x
   x = 4,942,783.79/3,426.72
6. Step 6: Final answer
   x = 1,442.42